Here we go again; speculation: My best guess is that they are to improve idle by reducing standing wave action.
With one carb per cylinder, there's a standing wave of fuel droplets in front of the carb at certain rpms--it's a length/ rpm tuning thing. (That's one of the functions of those "silencer" air boxes attached to the carbs; to contain this.) If you've seen that standing wave of fuel hanging in mid-air it's kinda scary; I mean, one good spark and....ka-boom!
My late and much mussed buddy Clint watched a big block Chevy running on a dyno with Hilborn injectors. There was a MASSIVE cloud of fuel droplets 18 inches high above each of the 8 injector pipes at certain rpms!
Jeff
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